LG 56DC1D Bedienungsanleitung

DLP Projection TV

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS : MD-61A

MODEL : 56DC1D

MODEL : 56DC1D-AB

website:http://biz.LGservice.com

e-mail:http://www.LGEservice.com/techsup.html

- 2 -

CONTENTS

CONTENTS ................................................................................................................... 2

SAFETY PRECAUTIONS ..............................................................................................3

CONTROL DESCRIPTIONS ..........................................................................................4

SPECIFICATIONS .........................................................................................................7

ADJUSTMENT INSTRUCTIONS ..................................................................................11

PRINTED CIRCUIT BOARD.........................................................................................20

BLOCK DIAGRAM .......................................................................................................28

EXPLODED VIEW .......................................................................................................32

EXPLODED VIEW PARTS LIST...................................................................................33

REPLACEMENT PARTS LIST ....................................................................................34

SVC. SHEET ....................................................................................................................

- 3 -

SAFETY PRECAUTIONS

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the

Schematic Diagram and Replacement Parts List.

It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent

X-RADIATION, Shock, Fire, or other Hazards.

Do not modify the original design without permission of manufacturer.

General Guidance

An isolation Transformer should always be used during the

servicing of a receiver whose chassis is not isolated from the AC

power line. Use a transformer of adequate power rating as this

protects the technician from accidents resulting in personal injury

from electrical shocks.

It will also protect the receiver and it's components from being

damaged by accidental shorts of the circuitry that may be

inadvertently introduced during the service operation.

If any fuse (or Fusible Resistor) in this TV receiver is blown,

replace it with the specified.

When replacing a high wattage resistor (Oxide Metal Film Resistor,

over 1W), keep the resistor 10mm away from PCB.

Keep wires away from high voltage or high temperature parts.

Due to high vacuum and large surface area of picture tube,

extreme care should be used in handling the Picture Tube. Do

not lift the Picture tube by it's Neck.

Before returning the receiver to the customer,

always perform an AC leakage current check on the exposed

metallic parts of the cabinet, such as antennas, terminals, etc., to

be sure the set is safe to operate without damage of electrical

shock.

Leakage Current Cold Check(Antenna Cold Check)

With the instrument AC plug removed from AC source, connect an

electrical jumper across the two AC plug prongs. Place the AC

switch in the on position, connect one lead of ohm-meter to the AC

plug prongs tied together and touch other ohm-meter lead in turn to

each exposed metallic parts such as antenna terminals, phone

jacks, etc.

If the exposed metallic part has a return path to the chassis, the

measured resistance should be between 1MΩand 5.2MΩ.

When the exposed metal has no return path to the chassis the

reading must be infinite.

An other abnormality exists that must be corrected before the

receiver is returned to the customer.

Leakage Current Hot Check (See below Figure)

Plug the AC cord directly into the AC outlet.

Do not use a line Isolation Transformer during this check.

Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor

between a known good earth ground (Water Pipe, Conduit, etc.)

and the exposed metallic parts.

Measure the AC voltage across the resistor using AC voltmeter

with 1000 ohms/volt or more sensitivity.

Reverse plug the AC cord into the AC outlet and repeat AC voltage

measurements for each exposed metallic part. Any voltage

measured must not exceed 0.75 volt RMS which is corresponds to

0.5mA.

In case any measurement is out of the limits specified, there is

possibility of shock hazard and the set must be checked and

repaired before it is returned to the customer.

Leakage Current Hot Check circuit

1.5 Kohm/10W

To Instrument’s

exposed

METALLIC PARTS

Good Earth Ground

such as WATER PIPE,

CONDUIT etc.

AC Volt-meter

IMPORTANT SAFETY NOTICE

0.15uF

- 4 -

DESCRIPTION OF CONTROLS

- When using the remote control aim it at the remote control sensor of the set.

- There maybe a defect in operation of this remote control in an excessively bright room when viewing this set.

TVD/A

INPUT

DVD

ARC

EXIT

VOL

TEXT

UPDATE

INDEX

Q.VIEW

MUTE

FAV

LIST

I/II

SLEEP

GUIDE

MULTI

INFO

VCR

POWER

123

456

789

SSMPSM

HOLD

SIZE

MIX

TIME

REVEAL

APM

MODE

selects another device.

POWER

switches the set on from standby or off to

standby.

INFO

displays information on top of the screen

whilst watching the TV.

(In Digital mode only)

COLOURED BUTTONS

These buttons are used for teletext (only

TELETEXT models) or programme edit.

VCR BUTTONS

controls a video cassette recorder.

MULTI (MULTIMEDIA)

selects the Component, RGB or HDMI

modes.

switches the set on from standby.

accepts your selection or displays the

current mode.

DD/ EEor FF/ GG

adjusts menu settings.

selects menu item.

Q.VIEW

returns to the previously viewed

programme.

NUMBER buttons

switches the set on from standby.

SSM

to select the sound appropriate to your

viewing programme character.

I/II

selects the sound output or the audio

mode.

APM (Adaptive Picture Mode)

Concurrently, compare with the

Dynamic

Standard

Mild

and

User

on the screen.

FAV (FAVOURITE)

selects a favourite programme.

D/A

selects analogue or digital mode.

switches the set on from standby.

INPUT

selects the TV, AV, Component, RGB or

HDMI modes.

switches the set on from standby.

ARC

changes the picture format.

GUIDE

shows a programme schedule.

(In Digital mode only)

EXIT

clears all on-screen displays and returns to

TV viewing from any menu.

displays on screen menus one by one.

exits the current menu.

memorizes menu changes.

TEXT

These buttons are used for teletext.

For further details, see the ‘Teletext’ section.

selects Subtitle on or off in

Digital

mode.

SLEEP

sets the sleep timer.

Brightness adjustment

adjusts screen brightness.

It returns to the default settings brightness

by changing mode source.

MUTE

switches the sound on or off.

LIST

displays the programme table.

PSM

adjusts the factory preset picture according

to the room.

VOL +/- (Volume Up/Down)

increases/decreases sound level.

PR +/- (Programme Up/Down)

selects a programme.

switches the set on from standby.

- 5 -

- Shown is a simplified representation of the set.

- What is shown here may be somewhat different from your set.

INPUT VOL PR

MENU OK

INPUT Button

FF/ GG

(Volume

Down/Up)

DD/ EE

(Programme Up/Down)

Operation Indicator/

Lamp Indicator/

Temperature Indicator

POWER Button

MENU Button

- Lamp indicator, operation indicator, and temperature indicator located below the front panel controls, reveal the

operating status of the DLP projection TV.

Function Status Indicators

OK Button

Front Panel Controls

Off Power Cord is not connected.

Red Power Cord is connected, TV is in standby mode.

Green TV turns on.

Orange (blinking) Power Cord is connected, TV is in booting sequence.

Orange Projection lamp is reaching the end of its life and needs to

be replaced with a new lamp. Contact your service centre.

Red (blinking) There is a problem with the lamp or around it. Contact an

authorized service centre.

Green (blinking) The lamp cover is not closed.

Orange The projection TV is overheating. Check the blocked vents

of the Projection TV .

Red The projection TV shuts down due to overheating.

Red (blinking) The projection TV shuts down, check the cooling fan.

Contact your service centre.

Operation Indicator

Lamp Indicator

Temperature Indicator

- 6 -

Back Panel Controls

RGB

(PC/DTV)

S-VIDEO

MONO

RGBIN

COMPONENTIN

(L)

(R)

AUDIO

RGBDVI

(L)

(R)

AUDIO

VIDEO

(L)

(R)

AVIN 1 AVOUT

DIGITALAUDIO

OPTICALOUTPUT

ANTENNA

SERVICEONLY

VIDEO

AUDIO

HDMI

/DVIIN

RGB

(PC/DTV)

S-VIDEO

MONO

RGB IN

COMPONENT IN

(L)

(R)

AUDIO

RGB/DVI

(L)

(R)

AUDIO

VIDEO

(L)

(R)

AV IN 1 AV OUT

DIGITAL AUDIO

OPTICAL OUT

SERVICE ONLY

VIDEO

AUDIO

HDMI

/DVI IN

ANTENNA

AC IN

AV IN 2

S-VIDEO

VIDEO

(L)/

(R)

MONO

AUDIO

S-VIDEO

INPUT

AV IN 2

ANTENNA

IN AV IN 1

AC IN

COMPO-

NENT IN

1/2

SERVICE

ONLY

RGB

(PC/DTV)

VIDEO IN

RGB/DVI

AUDIO IN

DIGITAL AUDIO

OPTICAL OUT

HDMI/DVI IN

AV OUT

- 7 -

SPECIFICATIONS

NOTE : Specifications and others are subject to change without notice for improvement

VApplication Range

This spec sheet is applied to the DLP TV used MD-61A chassis.

VSpecification

Each part is tested as below without special appointment.

1) Temperature : 25±5°C (CST : 40°C±2°C)

2) Relative Humidity : 65±10%

3) Power Voltage : Standard input voltage(240V~ ± 10%, 50Hz)

* Standard Voltage of each products is marked by model.

4) Specification and performance of each parts are followed each drawing and specification by part number in accordance with BOM.

5) The receiver must be operated for about 20 minutes prior to the adjustment.

VTest Method

1) performance : LGE TV test method followed.

2) Demanded other specification.

Safety : CB specification

EMC : CE specification

VModel Specification

62DC1D-AB

62DC1DA-AB Australia Safety : AS/NZS 60065, EMS :AS/NZS CISPR 13

Model Name Market Remark

Side 1/ Rear 1

Rear 1(Composite Signal)

Side 1/ Rear 1

Broadcasting system

Available Channel

Tuner IF

Video Input(2EA)

Monitor Out(1EA)

S-Video Input(2EA)

Input Voltage

Market

Screen Size

Aspect Ratio

Operating Temperature

Operating Humidity

Storage Temperature

Storage Humidity

Specification

Min Typ Max Unit

PAL B/B, DTV : DVB -T

VHF 00~12

UHF 20~75

CATV 02~ 44

DTV 06~12, 27~69

PAL : 38.90MHz(Picture), 34.40MHz(Soound)

DVB-T : 36.125MHz

PAL-B/G/H/I, PAL-M, NTSC-M, NTSC-44

240V~, 50Hz

Australia

60 inch

16:9

0 40 deg

85 %

-20 60 deg

85 %

No. Item Remark

- 8 -

VFeature and Function

VExternal Interface

Rear

Side 1, Rear 1

Rear, Y Pb Pr

Rear

Rear, Analog D-Sub 15 pin

Rear

Rear, Digital Interface with HDCP

Rear

Available for AV input/ Analog TV

Analog : Teletext, Digital : Sub Title

For control/ software update(service)

8 Buttons

Double Window

Remocon Code

RF Input

AV Input

Component Input

Component Audio(L,R) Input

RGB Input

RGB Audio(L,R) Input

HDMI Input

Audio Out(L,R)

Optical Audio

Monitor Out

Teletext

Serial Port (RS-232C)

EPF(Memory Card) Input

Remote Control

Local Key

Set Installation

Initial Setup

PIP/ POP Mode

SSC(Split Screen) Mode

Favorite List

APM

Specification

LG Code

1EA 1 Tuner(PAL/DVB-T)

2EA CVBS/ L/ R/ S-VIDEO (S-VIDEO Priority)

2EA 480i/ 576i/ 480p/ 576p/ 720p/ 1080i

2EA Component 1 & 2

1EA RGB-DTV : 480p/ 576p/ 720p/ 1080i

RGB-PC : Up to WXGA 59.87Hz

1EA L, R

1EA HDMI-DTV : 480p/ 576p/ 720p/ 1080i

HDMI-PC : Up to WXGA 59.87Hz

2EA Monitor Out, Optical Audio Out

1EA Output

1EA Rear

O TOP, FLOP, LIST, 2000page

1EA

Wireless Remote Control

Power, INPUT, Menu, OK, VOL(F,G), PR(D,E)

Desk top

Auto programme/ Time Zone/ Password

Dynamic/ Standard/ Mild/ User1

No. Item Remark

Sensory test

Video Input Level

Video output Frequency Response

Video output S/N

S-Video Input Level(Y)

S-Video Input Level(C-Burst)

component Video Input Level(Y,CB/PB,CR/PR)

HDMI Input Level

R/G/B Video Input Level

Audio Input S/N

Audio Input Distortion

Audio Input Level

Audio Input Frequency Range

No. Item Remark

0.85

0.256

0.6

0.3

0.6

0.47

0.05

0.286

0.7

0.63

1.15

0.316

0.8

0.7

0.8

0.79

Vpp

MHz

Vpp

Vrms

kHz

Min Typ Max Unit

- 9 -

VComponent Video Input (Y,CB/PB,CR/PR)

720 x 480

720 x576

720 x 480

720 x 576

1280 x 720

1920 x 1080

No. Resolution

15.73

15.75

15.6125

31.47

31.50

31.25

44.96

45.00

37.50

33.72

33.75

28.125

59.94

60.00

50.00

59.94

60.00

50.00

59.94

60.00

50.00

59.94

60.00

50.00

13.500

13.514

13.500

27.000

27.027

27.000

74.176

74.250

74.176

74.250

SDTV, DVD 480I(525I)

SDTV, DVD 576I(625I)

SDTV 480P

SDTV 576P

HDTV 720P

HDTV 720P 50Hz

HDTV1080I

HDTV 1080I 50Hz

H-freq.(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed

VRGB Input (PC)

640 x 350

640 x 480

800 x 600

1024 x 768

1280 x 720

1280 x 768

No. Resolution

31.468

31.469

37.861

37.500

35.156

37.879

48.077

46.875

48.363

56.476

60.023

45.000

47.776

70.09

59.94

72.80

75.00

56.25

60.31

72.18

75.00

60.00

70.06

75.02

60.00

59.87

25.17

31.50

36.00

40.00

50.00

49.50

65.00

75.00

78.75

74.25

79.50

EGA

VESA(VGA)

VESA(SVGA)

VESA(XGA)

WXGA

CVT(WXGA)

H-freq.(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed

- 10 -

VRGB Input (DTV)

720 x 480

720 x576

1280 x 720

1920 x 1080

No. Resolution

31.47

31.50

31.25

44.96

45.00

37.50

33.72

33.75

28.125

59.94

60.00

50.00

59.94

60.00

50.00

59.94

60.00

50.00

27.000

27.027

27.000

74.176

74.250

74.176

74.250

SDTV 480P

SDTV 576P

HDTV 720P

HDTV 720P 50Hz

HDTV1080I

HDTV 1080I 50Hz

H-freq.(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed

VHDMI Input (PC)

640 x 350

640 x 480

800 x 600

1024 x 768

1280 x 768

No. Resolution

31.468

31.469

37.861

37.500

35.156

37.879

48.077

46.875

48.363

56.476

60.023

47.776

70.09

59.94

72.80

75.00

56.25

60.31

72.18

75.00

60.00

70.06

75.02

59.87

25.17

31.50

36.00

40.00

50.00

49.50

65.00

75.00

78.75

79.50

EGA

VESA(VGA)

VESA(SVGA)

VESA(XGA)

CVT(WXGA)

H-freq.(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed

VHDMI Input (DTV)

720 x 480

720 x576

1280 x 720

1920 x 1080

No. Resolution

31.47

31.50

31.25

44.96

45.00

37.50

33.72

33.75

28.125

59.94

60.00

50.00

59.94

60.00

50.00

59.94

60.00

50.00

27.000

27.027

27.000

74.176

74.250

74.176

74.250

SDTV 480P

SDTV 576P

HDTV 720P

HDTV 720P 50Hz

HDTV1080I

HDTV 1080I 50Hz

H-freq.(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed

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